532 PROCEEDINGS OF THE AMERICAN ACADEMY 



der ; pubescence minute, silky, appressed ; stipules setaceous, mostly 

 very small ; leaflets 6-8, narrowly oblanceolate, 1-2' long, acute, pu- 

 berulent on both sides, at least half as long as the petioles ; racemes 

 loose and slender, 3-6' long ; bracts subulate ; flowers subverticillate 

 or scattered, small, on pedicels 2 - 3" long ; calyx narrowed and sac- 

 cate at base, minutely bracteolate, upper lip shortly toothed, the lower 

 subentire and a little longer ; petals blue, 3 - 5" long, equal ; banner 

 subpubescent, keel ciliate ; ovules 4 - 6 ; pod § ' long, very hairy. — 

 Washington Territory and Oregon, from Ft. Vancouver to Klamath 

 Valley and the northern Sierra, and eastward to Northern Utah. 

 L. arbustus, Dough, is a rather stouter, larger-leaved form, the leaflets 

 sometimes 2-J-' lonjr. 



31. L. argenteus, Pursh. Erect or ascending, 1-2° high, slender ; 

 pubescence minute, silky, appressed ; stipules small ; leaflets 5-8, 

 linear-lanceolate, f — 1£' long, acute, smooth above or nearly so, about 

 equalling the petioles ; racemes 2-6' long, nearly sessile ; flowers 

 subverticillate or scattered, pedicels £ - 2" long ; calyx campanulate, 

 gibbous but not spurred at base, minutely bracteolate, upper lip broad, 

 2-toothed, the lower subentire, slightly longer ; petals blue or cream- 

 colored, equal, 3 - 4" long, the banner very broad, naked or subhairy, 

 keel naked or subciliate ; ovules 5 - 3 ; pod f - 1' long. — Plains of 

 the Columbia and -Snake Rivers. Distinguished from the last chiefly 

 by the shape of the calyx and smoother leaves ; including its varieties, 

 this is the most widely diffused of the western species. 



Var. decumbens. {L. decumbens, Torr.) Raceme dense and many- 

 flowered ; stem usually stouter and more leafy. — In the Rocky Mts., 

 from Montana to New Mexico. 



Var. ARGOPHYLLUS. With the habit of var. decumbens, but more 

 copiously silky-pubescent, the leaflets nearly or quite equally so upon 

 both sides, longer than the petioles ; flowers larger, 5 - 6" long, blue or 

 ochroleucous, the calyx decidedly spurred. Approaching nearly to 

 L. laxiflorus. — Montana to New Mexico. 



32. L. holosericeus, Nutt. Erect or ascending, 1-1^° high; 

 pubescence silvery-silky, closely appressed ; stipules short ; leaflets 

 6-8, narrowly oblanceolate, f - \\' long, acute, very silky both sides, 

 at least half as long as the petioles ; racemes 3-6' long, nearly sessile ; 

 flowers often very small, verticillate, pedicels 1 - 2" long ; calyx 

 slightly spurred at base, minutely bracteolate, lips nearly equal, the 

 upper broad and shortly toothed, lower subentire ; petals apparently 



